feat: update example with Jaeger exporter (open-telemetry#283)

Author: mayurkale22

examples/node-basic/index.js

@@ -1,10 +1,18 @@
 'use strict';
 
 const opentelemetry = require('@opentelemetry/core');
-const { BasicTracer } = require('@opentelemetry/basic-tracer');
+const { BasicTracer, SimpleSpanProcessor } = require('@opentelemetry/basic-tracer');
+const { JaegerExporter } = require('@opentelemetry/exporter-jaeger');
 
+const options = {
+  serviceName: 'my-service'
+}
+const exporter = new JaegerExporter(options);
+
+const tracer = new BasicTracer();
+tracer.addSpanProcessor(new SimpleSpanProcessor(exporter));
 // Initialize the OpenTelemetry APIs to use the BasicTracer bindings
-opentelemetry.initGlobalTracer(new BasicTracer());
+opentelemetry.initGlobalTracer(tracer);
 
 // Create a span. A span must be closed.
 const span = opentelemetry.getTracer().startSpan('main');
@@ -14,14 +22,18 @@ for (let i = 0; i < 10; i++) {
 // Be sure to end the span.
 span.end();
 
+// flush and close the connection.
+exporter.shutdown();
+
 function doWork (parent) {
   // Start another span. In this example, the main method already started a
   // span, so that'll be the parent span, and this will be a child span.
   const span = opentelemetry.getTracer().startSpan('doWork', {
     parent: parent
   });
 
-  for (let i = 0; i <= 40000000; i++) {} // short delay
+  // simulate some random work.
+  for (let i = 0; i <= Math.floor(Math.random() * 40000000); i++) {}
 
   // Set attributes to the span.
   span.setAttribute('key', 'value');